Davs mum but it does kill one in every two smokers...which is pretty bad odds..
I think all those habits do get condemned but the thing is although alcohol and overeating do cause harm to self/others sometimes, smoking harms at least yourself, every time.
you can have a few units of alcohol without doing your body damage, and the occaisional food binge...but one little cigarette and you're filling your lungs poisonous chemicals...inhaling tar, killing alveoli..etc etc
Although alcohol related aggression/violence etc does harm people not everyone who drinks next to you will harm you, where someone smoking next to you does cause you direct harm..it might not be long term or noticeable harm, but you will be inhaling poisionous chemicals which will cause direct damage.
I cant believe anywhere sells the stuff anymore now that we know what it does to us, but thats the power of money I guess.
Also for those who smoke outside, away from people, if you're not changing your clothes and having a shower after every cig, your hair, skin and clothing are wafting around little doses of the lovely poision to all those who come into contact with you, which isn't great...
After watching my nan drown in her own lungs from a smoking related cause, I feel pretty angry with the whole thing...not that you'd notice of course :)